Differential D16990 Diff 60050 source/blender/compositor/realtime_compositor/shaders/compositor_glare_highlights.glsl

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source/blender/compositor/realtime_compositor/shaders/compositor_glare_highlights.glsl

	#pragma BLENDER_REQUIRE(gpu_shader_compositor_texture_utilities.glsl)			#pragma BLENDER_REQUIRE(gpu_shader_compositor_texture_utilities.glsl)

	void main()			void main()
	{			{
	/* The dispatch domain covers the output image size, which might be a fraction of the input image			/* The dispatch domain covers the output image size, which might be a fraction of the input image
	* size, so you will notice the output image size used throughout the shader instead of the input			* size, so you will notice the output image size used throughout the shader instead of the input
	* one. */			* one. */
	ivec2 texel = ivec2(gl_GlobalInvocationID.xy);			ivec2 texel = ivec2(gl_GlobalInvocationID.xy);

	/* Since the output image might be a fraction of the input image size, and since we want to			/* Since the output image might be a fraction of the input image size, and since we want to
	* evaluate the input sampler at the center of the output pixel, we add an offset equal to half			* evaluate the input sampler at the center of the output pixel, we add an offset equal to half
	* the number of input pixels that covers a single output pixel. In case the input and output			* the number of input pixels that covers a single output pixel. In case the input and output
	* have the same size, this will be 0.5, which is the offset required to evaluate the sampler at			* have the same size, this will be 0.5, which is the offset required to evaluate the sampler at
	* the center of the pixel. */			* the center of the pixel. */
	vec2 offset = (texture_size(input_tx) / imageSize(output_img)) / 2.0;			vec2 offset = vec2(texture_size(input_tx) / imageSize(output_img)) / 2.0;

	/* Add the aforementioned offset and divide by the output image size to get the coordinates into			/* Add the aforementioned offset and divide by the output image size to get the coordinates into
	* the sampler's expected [0, 1] range. */			* the sampler's expected [0, 1] range. */
	vec2 normalized_coordinates = (vec2(texel) + offset) / imageSize(output_img);			vec2 normalized_coordinates = (vec2(texel) + offset) / vec2(imageSize(output_img));

	vec4 input_color = texture(input_tx, normalized_coordinates);			vec4 input_color = texture(input_tx, normalized_coordinates);
	float luminance = dot(input_color.rgb, luminance_coefficients);			float luminance = dot(input_color.rgb, luminance_coefficients);

	/* The pixel whose luminance is less than the threshold luminance is not considered part of the			/* The pixel whose luminance is less than the threshold luminance is not considered part of the
	* highlights and is given a value of zero. Otherwise, the pixel is considered part of the			* highlights and is given a value of zero. Otherwise, the pixel is considered part of the
	* highlights, whose value is the difference to the threshold value clamped to zero. */			* highlights, whose value is the difference to the threshold value clamped to zero. */
	bool is_highlights = luminance >= threshold;			bool is_highlights = luminance >= threshold;
	vec3 highlights = is_highlights ? max(vec3(0.0), input_color.rgb - threshold) : vec3(0.0);			vec3 highlights = is_highlights ? max(vec3(0.0), input_color.rgb - threshold) : vec3(0.0);

	imageStore(output_img, texel, vec4(highlights, 1.0));			imageStore(output_img, texel, vec4(highlights, 1.0));
	}			}